Key challenges limiting the adoption of metallic plasmonic nanostructures for practical devices include structural stability and the ease of large‐scale fabrication. Overcoming these issues may require novel metamaterial fabrication with potentials for improved durability under extreme conditions. Here, a self‐assembled growth of a hybrid plasmonic metamaterial in thin‐film form is reported, with epitaxial Ag nanopillars embedded in TiN, a mechanically strong and chemically inert matrix. One of the key achievements lies in the successful control of the tilt angle of the Ag nanopillars (from 0° to 50°), which is attributed to the interplay between the growth kinetics and thermodynamics during deposition. Such an anisotropic nature offered by the tilted Ag nanopillars in TiN matrix is crucial for achieving broadband, asymmetric optical selectivity. Optical spectra coupled with numerical simulations demonstrate strong plasmonic resonance, as well as angular selectivity in a broad UV–vis to near‐infrared regime. The nanostructured metamaterials in this work, which consist of highly conductive metallic nanopillars in a durable nitride matrix, have the potential to serve as a novel hybrid material platform for highly tailorable nanoscale metamaterial designs, suitable for high temperature optical applications.

中文翻译：

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自组装的Ag-TiN混合等离子超材料：可定制的倾斜纳米柱和光学特性

限制在实际设备中采用金属等离子体纳米结构的关键挑战包括结构稳定性和易于大规模制造。克服这些问题可能需要新颖的超材料制造，其具有在极端条件下改善耐久性的潜力。在这里，报道了薄膜形式的混合等离激元超材料的自组装生长，外延Ag纳米柱嵌入TiN（一种机械强度高且化学惰性的基质）中。关键成就之一是成功控制了Ag纳米柱的倾斜角度（从0°到50°），这归因于沉积过程中生长动力学和热力学之间的相互作用。TiN基体中倾斜的Ag纳米柱提供的这种各向异性性质对于实现宽带非对称光学选择性至关重要。光谱与数值模拟相结合显示出强大的等离子体共振，以及在宽的可见光范围内对近红外范围内的角度选择性。这项工作中的纳米结构超材料由耐用氮化物基体中的高导电性金属纳米柱组成，具有潜力成为适用于高温光学应用的高度可定制纳米级超材料设计的新型混合材料平台。